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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f904cfdf2727bca065f117ce4ab6c6bd39c6537e379dba55bb81cdf80b505b72' 
  AND token = 'mxKXuQ+SgDwbID4YR2IjduMxFX6ddr83LtrVLbNVD60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}